I was wondering if someone could explain to me how you go about putting a signal into an amplifier and checking it on the output side with an oscilloscope. I have an amp with a fuzzy channel and I have read that you can input a signal to the amp, and then compare the two channels output for differences. How is this done? I am obviously a newb but I want to learn anything I can about amplifier repair, TV repair, whatever.
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Re: Testing Amplifier Output
you need to generate a signal the amp will handle, so 50hz > 15khz is o.k.
most scopes have a squarewave output for calibrating the probes - maybe that can be used. -
Re: Testing Amplifier Output
I'm guessing something like this could be used ?
http://www.ebay.co.uk/itm/New-DDS-Fu...item417a5aadb2Comment
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Re: Testing Amplifier Output
damn that's nice.
do you know 10years ago something like that would set you back hundreds!Comment
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Re: Testing Amplifier Output
You can use your PC for tone generator, it's free:
http://onlinetonegenerator.com/Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Testing Amplifier Output
Okay, I have a WAVETEK sweep generator Model 22 that I had given to me and a Phillips PM3217 Oscilloscope. Both units are a little older but still work. What I want to know is how to hook it up, and where to set it and what I am actually looking for once it is working? Is the amp plugged in or am I doing this on a cold circuit.
I also have a PICOSCOPE PC based oscilloscope that I can use as well. Patience please, I will get this. Like a sponge
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Re: Testing Amplifier Output
Make and model of the amplifier you are working on? Upload pictures of the amp also.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: Testing Amplifier Output
It is a QSC EX1600 amplifier. The schematic for it can be found here:
I do not have the amplifier open yet. Right now this is a general question. I will send pics as I go.Comment
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I have here a Magnum IA.100 which belongs to my parents.
The unit powers on & when the relay kicks in, you get a pop from the speakers (this might sound weird but is usual behavior for this amp). However, you get nothing coming through it from any of the inputs & no pops and crackls from any of the controls.
Because of the sound from the speaker when the amp turns on I have assumed that the output section probably works but I could be wrong & I'm not sure how to test that side of things further.
What Ive done........01-01-2025, 01:26 PM -
As the title.
I think these used to be sold in maplins a lot of years ago, it is an antique, but it's just fine for my needs.
It looks basic enough inside with large components so I could do a full recap pretty easily.
Any suggestions on what component would cause the symptoms of low volume output on both left and right rear speaker outputs?
If I turn up the rear gain level in the amp until the speakers start to distort it starts to distort quickly even though the speakers are still pretty quiet.
I thought I had dodgy speakers as I just fitted new old stock 6x9s in... -
Back in 2020 i bought a (2nd hand) compact ATX psu to replace my current one. My PC case only fits very short ATX power supplies so i didn't really have the choice of buying a decent 80Plus unit. The current unit is a modded YoungYear unit that i made a thread about a while ago:
A "nice" YoungYear unit? - Badcaps
The "new" unit is a KDM-M6480 480W psu, the 480W number is a typical KDM bullshit claim of course, but the 24A rating on the 12V rail seemed reasonable and the "Active PFC" claim gave me a bit of hope that this was going to be decent-ish.... -
Looks like I may need a little help from the PSU experts (or anyone really!
) I have a Corsair CX750M (Model 75-002019) that I picked up for free about 4 years ago. This is the PSU:
So here’s what’s strange about this one: it appears to work normally (normal output voltages) and any PC is stable with it. However, after a while (typically 10-20 minutes, but time can vary depending on the load), there is a sweetish smell of burned magnet wire insulation emanating from the PSU. Upon opening the PSU after this happened (many times), I was able to confirm... -
Hi:
I bought this amplifier from the 70s to try to repair it. So far it has no output sound, just noise. You can volume it up and down.
I've checked fuses and all are ok.
I've continued with capacitors:- The main black one should have 4700uF, but it has lost half of its capacity during these years.
- The ones that I've numbered have still a really low ESR and the full capacity after ¿40 years?
The 4 transitors are perfect. Desoldered and tested individually.
There are also components which I don't know exactly what they are....
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